Rectangular elbow structure for high-temperature and high-pressure working conditions
By combining the design of round-to-square pipes with variable cross-section rectangular elbows, along with guide plates and support trusses, the problem of insufficient structural strength of rectangular flues under high temperature and high pressure conditions is solved, achieving a more uniform fluid pressure distribution and stress dispersion, and enhancing the deformation resistance of rectangular elbows.
Patent Information
- Application Number
- CN202520411477.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Under high temperature and high pressure conditions, the structural strength at the bend of the irregular rectangular flue is insufficient, making it prone to deformation and affecting the normal operation of the system.
The design combines a round-to-square pipe with a variable cross-section rectangular elbow, along with a guide plate, supporting truss, and reinforcing frame, to achieve a gradual transition, disperse stress, and enhance the structural strength and stiffness.
By distributing fluid pressure evenly and dispersing stress, the possibility of deformation of the rectangular elbow structure is reduced, and its resistance to deformation under high temperature and high pressure conditions is improved.
Smart Images
Figure CN223677321U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of flue gas treatment, specifically relates to a rectangular elbow structure for high temperature and high pressure working condition. BACKGROUND
[0002] In the modern industrial production system, as the core channel of flue gas emission, the flue bears the important functions of conveying high temperature and high pressure flue gas, maintaining system negative pressure balance and ensuring production safety, and the design and installation of the flue are crucial to the operation efficiency and safety of the whole system.
[0003] The turning part of the special-shaped rectangular flue is mostly right angle, and the right angle turning leads to sudden change of flue gas flow and produces severe turbulent flow, so that the structure strength is insufficient at the turning part, especially in high pressure and high temperature environment, deformation and even damage are prone to occur, and the normal operation of the system is affected. INVENTION CONTENTS
[0004] The utility model embodiment provides a rectangular elbow structure for high temperature and high pressure working condition, aims at solving the technical problem of insufficient structure strength of flue turning part and easy deformation.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a rectangular elbow structure for high temperature and high pressure working condition, which comprises a round-to-square connecting pipe and a variable cross section rectangular elbow connected to the round-to-square connecting pipe, a plurality of interval distributed guide plates are sequentially arranged in the variable cross section rectangular elbow;The first support truss is arranged in the round-to-square connecting pipe;A plurality of second support trusses are arranged in the variable cross section rectangular elbow, and the second support trusses are arranged along the axis of the variable cross section rectangular elbow.
[0006] In a possible implementation manner, the rectangular elbow structure for high temperature and high pressure working condition further comprises a reinforcing frame, and the reinforcing frame comprises:
[0007] The first main reinforcing rib is fixedly connected to the free end of the round-to-square connecting pipe;
[0008] The second main reinforcing rib is fixedly connected to the free end of the variable cross section rectangular elbow;
[0009] The third main reinforcing rib is arranged on the inner arc surface of the variable cross section rectangular elbow;And
[0010] The fourth main reinforcing rib is arranged on the outer arc surface of the variable cross section rectangular elbow.
[0011] In a possible implementation manner, the reinforcing frame further comprises:
[0012] The first reinforcing rib extends along the axial direction of the round-to-square connecting pipe and is connected to the round-to-square connecting pipe and the variable cross section rectangular elbow respectively;And
[0013] Second reinforcing ribs, perpendicular to the first reinforcing ribs, are provided along the axis of the round-to-square transition pipe in sequence and at intervals, and the first reinforcing ribs and the second reinforcing ribs intersect to form a grid structure.
[0014] In a possible implementation, the variable cross-section rectangular elbow and the round-to-square transition pipe are each provided with a backing plate, and the end of the first support truss and the end of the second support truss are respectively connected to the corresponding backing plate.
[0015] In a possible implementation, the first support truss includes a plurality of inner support pipes arranged in cross.
[0016] In a possible implementation, the round-to-square transition pipe and the backing plate provided in the round-to-square transition pipe are provided with corresponding first exhaust holes, and the first exhaust holes are communicated with the inner support pipes.
[0017] In a possible implementation, the second support truss includes a support frame and a stabilizing frame provided in the support frame, the support frame and the stabilizing frame are both triangular structures, and the stabilizing frame divides the support frame into a plurality of triangular reinforcing spaces.
[0018] In a possible implementation, the inside of the reinforcing frame is communicated with the inside of the support frame, the variable cross-section rectangular elbow and the backing plate provided in the variable cross-section rectangular elbow are provided with corresponding second exhaust holes, and the second exhaust holes are communicated with the support frame.
[0019] In a possible implementation, the round-to-square transition pipe and the variable cross-section rectangular elbow are communicated to form an airflow cavity, and two groups of reinforcing components are fixed to the inner wall of the airflow cavity, and the flow guide plate is fixed between the two groups of reinforcing components.
[0020] The reinforcing component includes at least one reinforcing column, and the reinforcing column is arranged obliquely downward from the round-to-square transition pipe to the variable cross-section rectangular elbow.
[0021] In a possible implementation, the flow guide plate has a curved surface, and the curved surface faces the inside of the turning part of the variable cross-section rectangular elbow.
[0022] Compared with the prior art, the rectangular elbow structure for high-temperature and high-pressure working conditions has the advantages that the combination design of the round-to-square connecting pipe and the variable cross-section rectangular elbow realizes gradual transition of the round-to-square change instead of a right-angle sudden change, the fluid pressure distribution is more uniform, and the local impact load caused by the cross-section sudden change is reduced; the large-scale turbulent flow is divided into small-scale laminar flow through the plurality of mutually parallel flow guide plates, the scouring and abrasion of the fluid to the outer side wall of the elbow is reduced, the influence of the high-temperature airflow impact on the turning part of the rectangular elbow structure is reduced, thereby reducing the possibility of deformation of the rectangular elbow structure, the flow guide plates also serve as inner wall support skeletons, and the first support truss and the second support truss cooperatively inhibit the local deformation of the pipe wall; the first support truss and the second support truss effectively disperse stress, avoid the concentration of single-direction load, and enhance the strength and rigidity of the rectangular elbow structure, thereby resisting the deformation of the rectangular elbow structure under high-pressure working conditions. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 The rectangular elbow front view provided by the utility model embodiment;
[0024] Figure 2 The rectangular elbow left view provided by the utility model embodiment;
[0025] Figure 3 The first support truss end position partial section view adopted by the utility model embodiment;
[0026] Figure 4 The Figure 1 The A-A part partial section view;
[0027] Figure 5 The Figure 1 The B-B part partial section view;
[0028] Figure 6 The flow guide plate and the reinforcing column structure schematic view adopted by the utility model embodiment;
[0029] Figure 7 The Figure 6 The C-C part partial section view.
[0030] BRIEF DESCRIPTION OF DRAWINGS
[0031] 1, round-to-square connecting pipe; 2, variable cross-section rectangular elbow; 3, flow guide plate; 31, arc surface; 32, reinforcing rib; 4, first support truss; 41, inner support pipe; 5, second support truss; 51, support frame; 52, stable frame; 6, reinforcing frame; 61, first main reinforcing rib; 62, second main reinforcing rib; 63, third main reinforcing rib; 64, fourth main reinforcing rib; 65, first reinforcing rib; 66, second reinforcing rib; 7, pad plate; 8, reinforcing column. DETAILED DESCRIPTION
[0032] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer, the utility model will be described in further detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.
[0033] Please refer to Figures 1 to 7 The utility model is used for describing the rectangular elbow structure for high temperature and high pressure working conditions. A rectangular elbow structure for high temperature and high pressure working conditions comprises a round-to-square connecting pipe 1 and a variable cross-section rectangular elbow 2 connected to the round-to-square connecting pipe 1, a plurality of spaced flow guide plates 3 are sequentially arranged in the variable cross-section rectangular elbow 2; a first support truss 4 is arranged in the round-to-square connecting pipe 1; a plurality of second support trusses 5 are arranged in the variable cross-section rectangular elbow 2, and the second support trusses 5 are arranged along the axis of the variable cross-section rectangular elbow 2.
[0034] Compared with the prior art, the rectangular elbow structure for high temperature and high pressure working conditions provided in the example realizes gradual transition from round to square instead of right-angle abrupt change through the combined design of the round-to-square connecting pipe 1 and the variable cross-section rectangular elbow 2, so that the fluid pressure distribution is more uniform, and the local impact load caused by cross-section abrupt change is reduced. The large-scale turbulent flow is divided into small-scale laminar flow by the plurality of mutually parallel flow guide plates 3, the scouring and abrasion of the fluid to the outer wall of the elbow are reduced, the influence of high-temperature airflow impact on the turning part of the rectangular elbow structure is reduced, so that the possibility of deformation of the rectangular elbow structure is reduced, and the flow guide plates 3 also act as an inner wall support framework, which cooperates with the first support truss 4 and the second support truss 5 to suppress the local deformation of the pipe wall; the first support truss 4 and the second support truss 5 effectively disperse stress, avoid single-direction load concentration, and enhance the strength and rigidity of the rectangular elbow structure, so as to resist the deformation of the rectangular elbow structure under high pressure working conditions.
[0035] In some examples, referring to Figure 1 and Figure 2 The rectangular elbow structure for high temperature and high pressure working conditions further comprises a reinforcing frame 6, and the reinforcing frame 6 comprises a main reinforcing component, the main reinforcing component comprises a first main reinforcing rib 61, a second main reinforcing rib 62, a third main reinforcing rib 63 and a fourth main reinforcing rib 64, the first main reinforcing rib 61 is fixedly connected to the free end of the round-to-square connecting pipe 1, the second main reinforcing rib 62 is fixedly connected to the free end of the variable cross-section rectangular elbow 2, the third main reinforcing rib 63 is fixedly connected to the inner arc surface of the variable cross-section rectangular elbow 2, and the fourth main reinforcing rib 64 is fixedly connected to the outer arc surface of the variable cross-section rectangular elbow 2.
[0036] Specifically, the reinforcing frame further comprises first reinforcing ribs 65 and second reinforcing ribs 66, the first reinforcing ribs 65 extend along the axial direction of the circular-to-square connecting pipe 1 and are connected to the circular-to-square connecting pipe 1 and the variable cross-section rectangular elbow 2 respectively, and the second reinforcing ribs 66 are perpendicular to the first reinforcing ribs 65 and are arranged in the axial direction of the circular-to-square connecting pipe 1 in a spaced manner, and the first reinforcing ribs 65 and the second reinforcing ribs 66 cross to form a grid structure.
[0037] It should be noted that the variable cross-section rectangular elbow 2 is a curved tubular structure, the inner arc surface refers to the inner concave surface of the variable cross-section rectangular elbow 2, and the outer arc surface refers to the outer convex surface of the variable cross-section rectangular elbow 2.
[0038] The first main reinforcing rib 61 and the second main reinforcing rib 62 form a ring-shaped rigid frame at both ends of the pipe section, constrain the free deformation of the pipe end, and are “boundary anchoring points” of the overall reinforcing system. Under high-pressure working conditions, the end surface of the rectangular pipe is easy to expand outward due to the internal pressure, resulting in ovalization of the cross section, and the first main reinforcing rib 61 and the second main reinforcing rib 62 act as annular reinforcing rings, significantly reducing the circumferential tensile stress by increasing the end surface moment of inertia. Under high-temperature working conditions, the pipe expands along the axial direction, and the first main reinforcing rib 61 and the second main reinforcing rib 62 act as fixed ends, limiting the expansion direction through their own stiffness to avoid the transverse deviation of the elbow section due to free expansion. At the same time, constraining the end displacement can also reduce the temperature difference stress at the connection between the elbow and the straight pipe section, avoiding fatigue failure of the weld.
[0039] The first reinforcing rib 65 and the second reinforcing rib 66 cross to form a spatial grid, which can resist the bending moment of the elbow under high-temperature and high-pressure working conditions and inhibit the twisting deformation of the elbow structure. The first reinforcing rib 65 and the second reinforcing rib 66 can also be used as the mounting base of the external support, such as the lifting lug, which can avoid damage to the pipe wall caused by direct welding.
[0040] The reinforcing frame 6 forms a closed-loop force transmission path, which converts the internal fluid pressure into ring-shaped tensile stress and uniformly distributes it. The closed-loop structure can improve the overall external pressure resistance of the elbow.
[0041] In some embodiments, referring to Figure 3 , a gusset plate 7 is arranged in the variable cross-section rectangular elbow 2 and the circular-to-square connecting pipe 1, and the end of the first support truss 4 and the end of the second support truss 5 are connected to the corresponding gusset plate 7.
[0042] Specifically, the gusset plate 7 is located at the intersection of the first reinforcing rib 65 and the second reinforcing rib 66.
[0043] It should be noted that Figure 3 is the position of the gusset plate 7 corresponding to the second support truss 5, and the position of the gusset plate 7 corresponding to the first support truss 4 is different fromFigure 3 The same, namely Figure 3 The second support truss 5 in the figure is replaced by the first support truss 4.
[0044] Under high-temperature and high-pressure working conditions, the welding or contact points of the first support truss 4 and the second support truss 5 with the pipe wall are prone to stress concentration due to thermal expansion difference or fluid pressure. The gusset plate 7 disperses the local stress to a larger area by increasing the contact area; the gusset plate 7 can be made of flexible material (such as graphite composite gasket) or elastic structure, which can absorb the micro- friction energy between the first support truss 4 and the second support truss 5 and the pipe wall, and reduce the risk of fatigue cracks; the low thermal conductivity of the gusset plate 7 can reduce the heat transfer of the high-temperature medium through the metal first support truss 4 and the second support truss 5 to the outer wall, and reduce the thermal stress of the reinforcing frame 6.
[0045] The intersection of the first reinforcing rib 65 and the second reinforcing rib 66 is the core node of the reinforcing frame 6, and the internal fluid pressure is transmitted to the external reinforcing rib through the gusset plate 7 at the intersection, forming a closed loop force transmission path of "internal support and external hoop", and improving the overall stiffness; the intersection area has the highest stiffness, and the gusset plate 7 is fixedly connected to the intersection area, which can prevent the end of the first support truss 4 and the second support truss 5 from buckling under high pressure.
[0046] In some embodiments, referring to Figure 2 The first support truss 4 includes a plurality of mutually intersecting internal support pipes 41, which extend along the radial direction of the circular-to-square transition pipe 1 and abut against the circular-to-square transition pipe 1.
[0047] Specifically, the first support truss 4 is a cross truss.
[0048] In the transition section of the circular-to-square transition pipe 1, the sudden change in cross section is prone to cause stress concentration. The first support truss 4 is composed of orthogonal transverse and longitudinal internal support pipes 41, which can simultaneously disperse loads in the circumferential direction (resisting fluid pressure) and the axial direction (resisting thermal expansion thrust), and reduce local pressure peaks through four-directional support.
[0049] In some embodiments, the circular-to-square transition pipe 1 is provided with a first exhaust hole, which communicates the inside of the internal support pipe 51 with the outside of the circular-to-square transition pipe 1.
[0050] Specifically, the first exhaust hole is arranged at the intersection of the internal support pipe 41, the circular-to-square transition pipe 1, the first reinforcing rib 65, and the second reinforcing rib 66.
[0051] Under high-temperature working conditions, the thermal expansion of the gas in the closed first support truss 4 may cause explosion, and the exhaust hole can release pressure in real time to avoid structural bulging failure; the intersection is a dense area of reinforcing ribs, and the opening has the least effect on the overall strength.
[0052] In some embodiments, Figure 4 andFigure 5 The second support truss 5 comprises a support frame 51 and a stabilizing frame 52 arranged in the support frame 51, and the support frame 51 and the stabilizing frame 52 are both triangular structures, and the stabilizing frame 52 divides the support frame 51 into a plurality of triangular reinforcing spaces.
[0053] The outer support frame 51 resists fluid pressure, and the inner stabilizing frame 52 focuses on supporting the high flow rate area on the inner side of the elbow to prevent local collapse under negative pressure conditions; the fluid pressure is first absorbed by the outer support frame 51, and the residual load is transmitted to the inner stabilizing frame 52 through the nested nodes, forming a gradient dissipation mechanism to avoid chain collapse.
[0054] In some embodiments, the interior of the stabilizing frame 52 is in communication with the interior of the support frame 51, and the variable cross-section rectangular elbow 2 is provided with a second exhaust hole, which is in communication with the interior of the support frame 51 and the exterior of the variable cross-section rectangular elbow 2.
[0055] Specifically, the first exhaust hole is arranged at the intersection of the support frame 51, the variable cross-section rectangular elbow 2, the first reinforcing rib 65, and the second reinforcing rib 66.
[0056] Under high temperature conditions, the gas in the closed second support truss 5 may expand and cause an explosion, and the exhaust hole can relieve pressure in real time to avoid structural bulging failure; the intersection is a dense area of reinforcing ribs, and the opening has the least impact on the overall strength.
[0057] In some embodiments, referring to Figure 1 and Figure 6 The circular-to-square connecting pipe 1 and the variable cross-section rectangular elbow 2 are in communication to form an airflow cavity, and two sets of reinforcing components are fixedly connected to the inner wall of the airflow cavity, and the flow guide plate 3 is fixedly connected between the two sets of reinforcing components, and the reinforcing component comprises at least one reinforcing column 8, and the reinforcing column 8 is arranged obliquely downward from the circular-to-square connecting pipe 1 to the variable cross-section rectangular elbow 2.
[0058] It should be noted that Figure 6 The reinforcing component in the above embodiment is provided with two reinforcing columns 8.
[0059] The two sets of reinforcing columns 8 form a “clamping” structure to fix both ends of the flow guide plate 3 and limit the degree of freedom of the flow guide plate 3 under fluid impact, thereby preventing the flow guide plate 3 from overturning after being impacted by the fluid; the oblique reinforcing column decomposes the fluid pressure into axial and radial components, which are respectively borne by the two sets of reinforcing components, thereby avoiding single-point overload.
[0060] In some embodiments, referring to Figure 1 The flow guide plate 3 has a curved surface 31, and the curved surface 31 is directed inward to the turning part of the variable cross-section rectangular elbow 2.
[0061] The arc surface 31 not only guides the fluid to turn gently along the arc surface 31, reduces the impact of centrifugal force on the outer side of the elbow, but also optimizes the fluid flow path, reduces fluid resistance and improves flow efficiency.
[0062] The arc surface 31 decomposes large-scale vortex into laminar boundary layers along the surface of the flow guide plate 3, reduces the risk of flow separation, and forces the high-temperature fluid to be uniformly dispersed to avoid local overheating.
[0063] If there are solid particles in the fluid, the flow guide of the arc surface 31 can reduce the impact and wear of the particles on the outer side of the elbow.
[0064] In some embodiments, referring to Figure 7 The arc surface 31 is fixed with mutually perpendicular reinforcing ribs 32.
[0065] The presence of the reinforcing ribs 32 not only enhances the structural strength of the flow guide plate 3, but also has a positive impact on the flow guide effect of the flow guide plate 3. The arrangement of the reinforcing ribs 32 helps to guide the fluid to flow more smoothly through the surface of the flow guide plate 3, reducing the generation of fluid turbulence and vortex. At the same time, the reinforcing ribs 32 are welded on the arc surface 31 of the flow guide plate 3 in the form of an orthogonal grid, which suppresses the resonance of the flow guide plate 3 caused by fluid pulsation.
[0066] The mutually perpendicular reinforcing ribs 32 balance the thermal expansion direction of the flow guide plate 3 under high temperature, avoiding single-direction warping. The intersection of the reinforcing ribs 32 serves as a welding positioning reference, dispersing welding residual stress.
[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A rectangular bend structure for high temperature and high pressure service, characterized by, The structure of the rectangular bend for high-temperature and high-pressure working conditions further comprises a reinforcing frame, and the reinforcing frame comprises:
2. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein, a first main reinforcing rib fixed to the free end of the round-to-square connecting pipe; a second main reinforcing rib fixed to the free end of the variable cross-section rectangular bend; a third main reinforcing rib arranged on the inner arc surface of the variable cross-section rectangular bend; and a fourth main reinforcing rib arranged on the outer arc surface of the variable cross-section rectangular bend. The reinforcing frame further comprises:
3. The rectangular bend structure for high temperature and high pressure service as claimed in claim 2 wherein, a first reinforcing rib extending along the axial direction of the round-to-square connecting pipe and connected to the round-to-square connecting pipe and the variable cross-section rectangular bend respectively; and a second reinforcing rib perpendicular to the first reinforcing rib, a plurality of the second reinforcing ribs being arranged in the axial direction of the round-to-square connecting pipe in sequence, and the first reinforcing rib and the second reinforcing rib forming a grid structure by intersecting each other. The variable cross-section rectangular bend and the round-to-square connecting pipe are both provided with a backing plate, and the end of the first supporting truss and the end of the second supporting truss are connected to the corresponding backing plate.
4. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein, The first supporting truss comprises a plurality of mutually intersecting inner supporting pipes, the inner supporting pipes extending along the radial direction of the round-to-square connecting pipe and abutting against the round-to-square connecting pipe.
5. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein, The round-to-square connecting pipe and the backing plate arranged in the round-to-square connecting pipe are provided with corresponding first exhaust holes, and the first exhaust holes are communicated with the inner supporting pipes.
6. The rectangular bend structure for high temperature and high pressure service as claimed in claim 5 wherein, The second supporting truss comprises a supporting frame and a stabilizing frame arranged in the supporting frame, the supporting frame and the stabilizing frame both have a triangular structure, and the stabilizing frame divides the supporting frame into a plurality of triangular reinforcing spaces.
7. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein The interior of the stabilizing frame is communicated with the interior of the supporting frame, the variable cross-section rectangular bend and the backing plate arranged in the variable cross-section rectangular bend are provided with corresponding second exhaust holes, and the second exhaust holes are communicated with the supporting frame.
8. The rectangular bend structure for high temperature and high pressure service as claimed in claim 7, wherein, The round-to-square connecting pipe and the variable cross-section rectangular bend are communicated to form an airflow cavity, and two groups of reinforcing components are fixed to the inner wall of the airflow cavity, and the flow guide plates are fixed between the two groups of reinforcing components.
9. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein, The reinforcing component comprises at least one reinforcing column, and the reinforcing column is arranged obliquely downward from the round-to-square connecting pipe to the variable cross-section rectangular bend. The flow guide plate has an arc surface, and the arc surface faces the inner side of the turning part of the variable cross-section rectangular bend.
10. The rectangular bend structure for high temperature and high pressure service as claimed in claim 1, wherein,